EP2456267A1 - Verfahren zur Anpassung der Übertragungsleistung der von mindestens einer Heimbasisstation übertragenen Signale - Google Patents

Verfahren zur Anpassung der Übertragungsleistung der von mindestens einer Heimbasisstation übertragenen Signale Download PDF

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Publication number
EP2456267A1
EP2456267A1 EP10191903A EP10191903A EP2456267A1 EP 2456267 A1 EP2456267 A1 EP 2456267A1 EP 10191903 A EP10191903 A EP 10191903A EP 10191903 A EP10191903 A EP 10191903A EP 2456267 A1 EP2456267 A1 EP 2456267A1
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EP
European Patent Office
Prior art keywords
base station
home base
hbs
mobile terminal
home
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10191903A
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English (en)
French (fr)
Inventor
Julien Guillet
Loïc Brunel
Nicolas Gresset
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Mitsubishi Electric R&D Centre Europe BV Netherlands
Original Assignee
Mitsubishi Electric Corp
Mitsubishi Electric R&D Centre Europe BV Netherlands
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Mitsubishi Electric Corp, Mitsubishi Electric R&D Centre Europe BV Netherlands filed Critical Mitsubishi Electric Corp
Priority to EP10191903A priority Critical patent/EP2456267A1/de
Priority to EP11775986.0A priority patent/EP2641437B1/de
Priority to PCT/EP2011/068942 priority patent/WO2012065827A1/en
Priority to US13/824,659 priority patent/US9167538B2/en
Priority to CA2812654A priority patent/CA2812654C/en
Priority to JP2013539187A priority patent/JP5997172B2/ja
Publication of EP2456267A1 publication Critical patent/EP2456267A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average, variance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile

Definitions

  • the present invention relates generally to a method and a device for adjusting the transmission power of the signals transferred by a base station through a wireless interface.
  • Wireless cellular telecommunication networks are largely deployed but there are still some areas not covered by the base stations of the wireless cellular telecommunication network.
  • the base stations are deployed by an operator according to a given planning.
  • the access to the wireless cellular telecommunication network might not be possible or might require a too high transmission power or a too low spectral efficiency, i.e., too many system resources for a mobile terminal located in a building, if the signals radiated by the base stations and/or by the mobile terminal are too attenuated.
  • Particular base stations which are not necessarily deployed by operator and thus not following a given planning, like home base stations or femto base stations or pico base stations or relays, may provide coverage areas within the buildings and base station offload. Relays may also provide outdoor coverage extension.
  • the home base stations or femto base stations provide a limited coverage area. Due to the constant coverage area size reduction and spectral efficiency increase, inter-cell interference has become a main issue. Inter-cell interference coordination (ICIC) techniques intend to mitigate the inter-cell interference problem.
  • ICIC Inter-cell interference coordination
  • a mobile terminal reports to the base station the mobile terminal is currently served by, the interference it receives from neighbouring base stations and/or home base stations.
  • Base stations exchange also messages between each other in order to allow an efficient ICIC.
  • the base station to base station messages need establishment of links between the base stations. The same links between base stations and home base stations or between home base stations cannot be established in some cases.
  • a massive deployment of home base stations prevents from having such links between a base station and all the home base stations located within the coverage area of the base station. Even if the links exist, the amount of messages on these links must be as low as possible in order not to put an excessive burden on the core network. These home base stations may strongly interfere with the base station and even create coverage holes.
  • the interference impact depends on the distance separating the base station and the home base station.
  • the interference impact is not only related to the distance between the home base station and the base station.
  • the interference also depends on the shadowing between each mobile terminal close to the home base station and the base station.
  • the path gain between the home base station and the base station or the received power from the base station at the home base station is even more relevant.
  • the home base stations may enable a limited number of mobile terminals to access the wireless cellular telecommunication network through their respective resources.
  • the mobile terminals allowed to access the resources of the network through the home base station may be determined by the owner of the home base station, the network or a combination of both.
  • the owner must be understood here in the general sense: the owner may only be the main user of the home base station, the owner may be the person who rents the home base station or the owner may be the person who accommodates the home base station in his house or office.
  • only mobile terminals of the owner of the home base station and its family can access the wireless cellular telecommunication network through the home base station. These mobile terminals are associated with the home base station.
  • Base stations enable a large number of mobile terminals to access the wireless cellular telecommunication network through their respective resources.
  • the mobile terminals allowed to access the resources of the network through the base station may be determined by the operator of the wireless cellular telecommunication network.
  • the cell of a base station is usually much larger than a cell of a home base station.
  • Inter-cell interference coordination (ICIC) techniques have been extensively discussed between base stations.
  • the present invention aims at avoiding that signals transferred between home base stations and mobile terminals served by the home base stations interfere on signals transferred between base stations and mobile terminals served by the base stations.
  • the present invention concerns a method for adjusting the transmission power of the signals transferred by at least one home base station through a wireless interface, the at least one home base station being located in the cell of a base station, characterised in that the method comprises the steps of:
  • the present invention concerns also a device for adjusting the transmission power of the signals transferred by at least one home base station through a wireless interface, the at least one home base station being located in the cell of a base station, characterised in that the device comprises :
  • the level of degradation in at least one area around at least one home base station is controlled. For instance, the degradation close to the home base station, inside a building or in a small zone around the building, is overlooked. Furthermore, the outage probability approach is well suited for the random behaviour of received powers.
  • the function g representing the mobile terminal performance degradation is defined according to a ratio of the base station interference level form neighbouring base stations and the received power from the at least one home base station or a ratio of base station signal to interference plus noise ratio with the interference from the at least one home base station and base station signal to interference plus noise ratio without the interference from the at least one home base station or a ratio of Shannon capacity from base station with the interference from the at least one home base station and Shannon capacity from base station without the interference from the at least one home base station or a ratio of modelled spectral efficiency from base station with the interference from the at least one home base station and modelled spectral efficiency from base station without the interference from the at least one home base station or the ratio of empirical spectral efficiency from base station with the interference from the at least one home base station and empirical spectral efficiency from base station without the interference from the at least one home base station.
  • the function g is representing the mobile terminal performance degradation in a realistic way, ensuring efficient inter-cell interference coordination.
  • the present invention is effective when modelled spectral efficiency are used, i.e. when spectral efficiency is derived from a formula or when empirical techniques are used like for example a use of at least one look-up table.
  • plural home base stations are comprised in the cell of the base station and the same signal transmission power is used by each home base station comprised in the cell of the base station.
  • the transmit power computation is common to all home base stations.
  • the computation cost is reduced.
  • the transmit power can be easily broadcasted to all home base stations by the base station and this common transmit power remains valid for a longer time.
  • plural home base stations are comprised in the cell of the base station and the home base stations comprised in at least one subset of home base stations comprised in the cell of the base station use the same signal transmission power and the signal transmission power used by at least one home base station which does not belong to one subset of home base stations is different from the signal transmission power used by the home base stations comprised in said one subset of home base stations.
  • the transmit power computation is common to all home base stations of the subset of home base stations.
  • the computation cost is reduced.
  • the transmit power can be easily broadcasted to all home base stations of the subset of home base stations for example by the base station and this common transmit power remains valid for a longer time.
  • the subset of home base stations comprises all the home base stations which are located in a same building or in a same predetermined area of a building.
  • plural home base stations are comprised in the cell of the base station and the signal transmission power used by each home base station is peculiar to each home base station comprised in the cell of the base station.
  • the transmit power of a home base station is well adapted to its situation.
  • plural home base stations are comprised in the cell of the base station and in that the signal transmission power used by each home base station comprised in the cell of the base station is decomposed into a common value for the home base stations comprised in the cell of the base station and an adjustment value peculiar to each home base station comprised in the cell of the base station.
  • the transmit power of a home base station is well adapted to its situation while also taking into account the situation of other base stations in order to control the global degradation in the cell of the base station.
  • the transmit power is further determined so as to have the same high interference reference zone size, the same outage probability P out , the same threshold RT and the same function g for each home base station comprised in the cell of the base station.
  • the present invention provides a high interference reference zone equalisation method.
  • the function g depends on the useful power P U , BS-MT received by a mobile terminal located in the high interference reference zone from the base station and/or depends on the interfering power P I, BS-MT received by the mobile terminal from at least one neighbouring base station plus Additive White Gaussian Noise and/or depends on the power P I,HBS-MT which is received by the mobile terminal from the home base station or on one path gain or on a combination of the path gains P G,HBS-MT between the at least one home base station and the mobile terminal and the signal power which is radiated by said at least one home base station.
  • the useful power P U, BS-MT received by at least one mobile terminal from the base station, and/or the interfering power P I, BS-MT from at least one neighbouring base station plus Additive White Gaussian Noise and/or the power P I,HBS-M received by the mobile terminal from the at least one home base station or one path gain or the combination of the path gains P G,HBS-MT between the at least one home base station and the mobile terminal are obtained by measurements.
  • measurements may be accumulated on long periods for mobile terminals which have previously moved though the cell of the base station.
  • the useful power P U, BS-MT received by the mobile terminal from the base station, and/or the interfering power P I, BS-MT from at least one neighbouring base station plus Additive White Gaussian Noise and/or the power P I,HBS-MT received by the mobile terminal from the at least one home base station or one path gain or the combination of the path gains P G,HBS-MT between the at least one home base station and the mobile terminal are obtained from a given model.
  • the useful power P U, BS-MT received by the mobile terminal from the base station, and/or the interfering power P I, BS-MT from at least one neighbouring base station plus Additive White Gaussian Noise and/or the power P I,HBS-MT received by the mobile terminal from the home base station or one path gain or the combination of the path gains P G,HBS-MT between the at least one home base station and the mobile terminal are obtained from samples generated from a method based on a given model.
  • the signal transmission power for the at least one home base station is determined according to information representative of the location of at least one mobile terminal.
  • path gain model and/or data-base e.g., a map.
  • path gain information in the high interference reference zone can be obtained from a data-base.
  • the signal transmission power for the at least one home base station is determined from a quantile at a given probability value P out of a function u of random variables, the quantile being the value of u such that the probability that u is lower than u Q is equal to P out .
  • the quantile is obtained using a random model, numerical values or a combination of both.
  • the quantile is efficiently obtained depending on the knowledge on random variables, i.e., on whether they are distributed according to a known model or they are obtained from measurements or a combination of both.
  • the present invention concerns computer programs which can be directly loadable into a programmable device, comprising instructions or portions of code for implementing the steps of the method according to the invention, when said computer programs are executed on a programmable device.
  • Fig. 1 represents a wireless cellular telecommunication network in which the present invention is implemented.
  • Fig. 1 one base station BS and plural home base stations HBS1 to HBS5 of a wireless cellular telecommunication network are shown.
  • the base station BS is for example a base station of a wireless cellular telecommunication network which serves mobile terminals located in the cell CE of the base station BS.
  • Fig. 1 Only one mobile terminal MT is shown in Fig. 1 for the sake of clarity.
  • the home base stations HBS1 to HBS5 are named also femto base stations or pico base stations or relays.
  • a relay is a home base station HBS which is connected to the wireless cellular telecommunication network via a wireless link with the base station BS.
  • Each home base station HBS1 to HBS5 is for example located into home and may enable mobile terminals MT associated to the home base station HBS to access the wireless cellular telecommunication network.
  • the home base stations HBS1 and HBS5 are located in the same building.
  • a home base station HBS and a mobile terminal MT are associated when the home base station HBS belongs to the owner of the mobile terminal MT or when the home base station HBS belongs to the family or friends of the owner of the mobile terminal MT.
  • a mobile terminal MT When a mobile terminal MT is served by a base station BS or a home base station HBS, it can receive or establish or continue a communication with a remote telecommunication device through the base station BS or the home base station HBS.
  • the base station BS is able to receive signals transferred by mobile terminals MT which are located in the area CE.
  • the base station BS transfers signals which can be received and processed by mobile terminals MT located in the cell CE.
  • the base station BS has only one cell CE.
  • the present invention is also applicable when the base station BS has plural cells. In that case, the present invention is applied independently for each cell of the base station BS.
  • the home base stations HBS are comprised in the cell CE of the base station BS.
  • the home base stations HBS radiate signals which can be received and processed by mobile terminals.
  • the level of degradation is characterised here by a high-interference reference zone (HIRZ), which is a zone where mobile terminals performances in downlink are degraded beyond a certain threshold.
  • HIRZ high-interference reference zone
  • the high interference reference zone HIRZ1 is a zone around the home base station HBS1 where mobile terminals performances in downlink are degraded beyond a certain threshold as both base station BS and home base station HBS1 radiate signals in that zone.
  • the high interference reference zone HIRZ1 is also a zone around the home base station HBS5 where mobile terminals performances in downlink are degraded beyond a certain threshold as both base station BS and home base station HBS5 radiate signals in that zone.
  • the high interference reference zone HIRZ2 is a zone around the home base station HBS2 where mobile terminals performances in downlink are degraded beyond a certain threshold as both base station BS and home base station HBS2 radiate signals in that zone.
  • the high interference reference zone HIRZ3 is a zone around the home base station HBS3 where mobile terminals performances in downlink are degraded beyond a certain threshold as both base station BS and home base station HBS3 radiate signals in that zone.
  • the high interference reference zone HIRZ4 is a zone around the home base station HBS4 where mobile terminals performances in downlink are degraded beyond a certain threshold as both base station BS and home base station HBS4 radiate signals in that zone.
  • a server Serv is shown.
  • the server Serv is a core network device that may control plural cells of plural base stations BS and may execute the present algorithm instead of the base station BS.
  • the server Serv may also be named a coordinator.
  • the base station BS or the server Serv or home base stations HBS performs or perform inter cell interference coordination procedure by:
  • the transmit power P t,HBS of signals radiated by the at least one home base station HBS is set in order to ensure a given outage probability P out of a given function g, representing the mobile terminal performance degradation, in a given zone Zone MT around the at least one home base station HBS and where RT is a threshold.
  • the zone Zone MT may be the union of the zones HIRZ1 to HIRZ4 or may be equal to one of the zones HIRZ1 to HIRZ4.
  • P t , HBS is such that Pr g ⁇ RT
  • Zone MT P out .
  • the function g is the ratio between the mobile terminal MT served by the base station BS capacity with home base station HBS signal radiation and mobile terminal MT capacity without home base station HBS signal radiation.
  • Each high interference reference zone HIRZ1 to HIRZ4 is a small zone around the home base station HBS1 to HBS5 which is represented in Fig. 1 as a circle.
  • the home base station HBS1 to HBS5 radio signal transmit power is set in order to reach these values.
  • the function g may depend on the useful power P U, BS-MT received by mobile terminal MT from the base station BS, on the interfering power P I, BS-MT from neighbouring base stations plus Additive White Gaussian Noise (AWGN) and on the power received by the mobile terminal MT from home base station HBSi P t,HBS + P G,HBS-MT , where P G,HBS-MT is the path gain between the home base station HBSi and the mobile terminal MT.
  • AWGN Additive White Gaussian Noise
  • P t,HBS is such that : Pr ⁇ g ⁇ P U , BS - MT , P I , BS - MT , P t , HBS + P G , HBS - MT ⁇ RT
  • Zone MT P out
  • the function g may depend on the useful power P U, BS-MT received by mobile terminal MT from the base station BS, on the interfering power P I, BS-MT from neighbouring base stations plus Additive White Gaussian Noise (AWGN) and on the power received by the mobile terminal MT from home base station HBS1 and HBS5 P t,HBS + P G,HBS-MT , where P G,HBS-MT is representative of the combination of the path gains between the home base station HBS 1 and the mobile terminal MT and between the home base station HBS5 and the mobile terminal MT.
  • AWGN Additive White Gaussian Noise
  • P t,HBS is such that : Pr ⁇ g ⁇ P U , BS - MT , P I , BS - MT , P t , HBS + P G , HBS - MT ⁇ RT
  • Zone MT P out
  • the statistical properties of the two first variables P U, BS-MT and P I, BS-MT are the statistical properties over the whole base station BS coverage CE or for a given zone around at least one given home base station HBS, depending if the inter cell interference coordination is global or local.
  • This high interference reference zone HIRZi can be defined as a closed outline e.g., a circle around the home base station HBSi, representing from the base station BS side the maximum coverage of the home base station HBSi or the home base station HBSi building boundary.
  • the statistical properties of the third variable P G,HBS-MT are the statistical properties for a combination of path gains of two home base stations HBS 1 and HBS5, i.e., for the high interference reference zone HIRZ1 around the home base stations HBS1 and HBS5.
  • This high interference reference zone HIRZ1 can be defined as a closed outline e.g., a circle around the home base stations HBS1 and HBS5, representing from the base station BS side the maximum coverage of the home base stations HBS1 and HBS5 or the home base station HBS1 and HBS5 building boundary.
  • the high interference reference zone HIRZ1 will be considered herein after as the circle around the home base stations HBS1, representing from the base station BS side the maximum coverage of the home base station HBS 1.
  • the i-th high interference zone HIRZi can be characterised by a scalar value r DZ,HBSi representing the radius of a circle and being an approximation like an average or a maximum value of the distance between the home base station HBSi and its building boundary in a given direction or its coverage in a given direction.
  • the function g can also be expressed as g ( SINR BS , P I, BS-MT , P t,HBS + P G,HBS - MT ) or g(P U, BS-MT , SINR BS , P t,HBS + P G,HBS-MT ) .
  • the power P t,HBS may be expressed as a function f of three variables which may be potentially random variables, the function increasing f with the two first variables P U , BS-MT and P I, BS-MT and decreasing with the last one P G,HBS-MT .
  • P t,HBS Q - P G , HBS - MT + f ⁇ P U , BS - MT , P I , BS - MT ; RT P out where Q u ( P out ) is the quantile at P out of the function u which is a function of random variables.
  • a quantile u Q Q u ( P out ) is the value u Q of u such that the probability that u is lower than u Q is equal to P out .
  • the function f is directly related to the degradation function g .
  • the function f is always increasing with P U, BS-MT and P I, BS-MT and decreasing with RT .
  • an increased P U, BS-MT means that mobile terminals MT are less sensitive to home base station HBS interference.
  • An increased P I, BS-MT means that the interference from base station BS becomes more dominant and the home base station HBS impact is reduced.
  • an increased RT means that the criterion is stricter and the home base station HBS transmit power must be reduced in order to satisfy the base station BS performance criterion.
  • the transmit power P t,HBS follows the same trends.
  • the transmit power P t,HBS is also increasing with P out by the quantile definition because higher outage probability P out is allowed.
  • P G,HBS-MT For a same variance of P G,HBS-MT , it is also decreasing with the average of P G,HBS-MT , since an increased P G,HBS-MT means higher impact on the mobile terminals MT.
  • f should also take into account the performance saturation when the signal to interference plus noise ratio (SINR) increases beyond a maximum signal interference plus noise ratio value SINR max .
  • SINR signal to interference plus noise ratio
  • the system peak rate is always limited by the higher order modulation scheme, the higher coding rate, the Multiple Input Multiple Output scheme with higher spectral efficiency.
  • This saturation can be easily introduced in the inter cell interference coordination method by replacing P I, BS-MT by max( P I , BS-MT , P U, BS-MT - 10. log( SINR max )).
  • the random variables are not considered on the same geographical zones.
  • the transmit power P t,HBS is the same for each home base station HBS1 to HBS5 comprised in the cell CE.
  • the transmit power of each home base station HBS1 to HBS5 is set in order to guarantee a given outage probability on a global zone Zone MT obtained by the union of all individual zones HIRZ1 to HIRZ4 around home base stations HBS1 to HBS5.
  • the inter cell interference coordination is performed by the base station BS or by the server Serv.
  • the base station BS or the server Serv then informs the home base stations HBS of P t,HBS or home base stations HBS compute it by themselves.
  • the base station BS If the base station BS does not know the exact position of all the home base stations HBS, the base station BS assumes that there are home base stations HBS everywhere in the cell CE. Thus, the statistical properties of P U, BS-MT and P I, BS-MT are computed for all mobile terminals locations in the cell CE of the base station BS.
  • P G,HBS-MT the statistical properties of P G,HBS-MT are only computed on the zone around home base stations HBS, since this is the zone which is of importance for P t,HBS determination and averaged over all HBSs.
  • P t , HBS - P ⁇ G , HBS - MT Zone MT + Q P G , HBS - MT - P ⁇ G , HBS - MT Zone MT + f ⁇ P U , BS - MT , P I , BS - MT ; RT
  • Zone MT P out where x denotes the average of x, ( P out ) is the quantile at P out , i.e., the value such that the cumulative density function of u equals P out of the function u on the union zone Zone MT of HIRZ1 to HIRZ4.
  • the transmit power P t,HBS (HBSi) is specific to each home base station HBS and this specific power P t,HBS (HBSi) is set in order to guarantee a given outage probability on the zone HIRZi.
  • the inter cell interference coordination is performed independently for each home base station HBSi.
  • the zone HIRZ1 is a zone around the home base stations HBS1 and HBS5 and is individually considered.
  • the transmit power P t,HBS (HBS1) is equal to the transmit power P t,HBS (HBS5) and this specific power P t,HBS (HBS1) or P t,HBS (HBS5) is set in order to guarantee a given outage probability on the zone HIRZ1.
  • f(P U, BS-MT , P I, BS-MT , RT ) can be considered as deterministic or as having a variance much lower than P G,HBS-MT on Zone MT .
  • the variables involved in the transmit power computation can be random or deterministic.
  • a variable may be random because there are fundamentally different possible values. It might be the case for P U, BS-MT and P I BS-MT . For example, when global inter cell interference coordination is performed, the values of P U, BS-MT and P I, BS-MT are taken over the whole base station BS cell CE.
  • the powers P U, BS-MT and P I , BS-MT may be random.
  • the powers P U, BS-MT and P I, BS-MT may be random.
  • a variable may be random because there is a lack of knowledge on the variable.
  • the variable is considered as random even if it has a fixed value over the considered zone HIRZi. For instance, if the location information is taken into account, for example, by using a model where the logarithm of the mean path gain is a linear function of the logarithm of the distance, the shadowing information is not available and the powers P U, BS-MT and P I, BS-MT become random variables due to the unknown shadowing with local inter cell interference coordination, even if the inter cell interference coordination time scale is low and the shadowing correlation distance high.
  • the powers P U, BS-MT and P I, BS-MT or the path gain P G, HBS-MT become random variables.
  • the variance of P U, BS-MT on the zone HIRZi depends on the shadowing correlation distance. If the correlation distance increases, the variance of P U, BS-MT tends to zero, if the shadowing correlation distance decreases down to zero, the variance of P U, BS-MT becomes twice the variance of the shadowing. If the duration between two inter cell interference coordination updates increases, we can obtain many measurements between two inter cell interference coordination updates, assuming temporal variation or spatial variation and mobile terminal mobility, and decrease this variance.
  • the path gain P G, HBS-MT is generally considered as a random variable, since around the home base station HBSi, we observe different path gain values depending on the mobile terminal MT position.
  • P G t ⁇ x P ⁇ G x + ⁇ BS , Sh , space ⁇ ⁇ ConstantOverTime x + ⁇ BS , Sh , time ⁇ ⁇ TimeVariable x ⁇ t ⁇ ConstantOverTime ( x ) and ⁇ TimeVariable ( x , t ) are Gaussian standard variables with exponential correlation.
  • ⁇ BS,sh,time is around a few dB and ⁇ BS,sh,space in the order of 8 dB for a log(P) vs. log(d) linear model as a function of distance d for mean path loss plus antenna angular selective attenuation for the variable P ⁇ G ( x ).
  • the standard deviation that is considered should depend of the HIRZi size and the time duration between inter cell interference coordination updates.
  • the measurement is considered as the mean of a Gaussian distribution representing the shadowing in the given zone Zone MT .
  • E denotes the mean over all shadowing realisations
  • the sum is over all N time/space samples on the given zone Zone MT during the inter cell interference coordination period for a discrete definition
  • each j and each j' corresponds to one location in the zone Zone MT at one instant.
  • ⁇ ⁇ ⁇ BS,Sh and ⁇ is approximately equal to null value for a large correlation distance and a large correlation time with respect to the zone Zone MT and inter cell interference coordination period.
  • the probability distributions of the different variables and so the quantile of the global variable may be obtained using two different ways.
  • a first way is to use a modelling approach like path loss models and Gaussian models. For that, position measurements of the mobile terminal MT need to be obtained because path loss models are generally related to the relative position of the mobile terminal MT from the serving base station BS or only the distance between base station BS and the mobile terminal MT need to be obtained.
  • the distance or relative position of the closest home base station HBS from the serving base station BS may be used instead of the distance or relative position of the mobile terminal MT from the serving base station BS.
  • a second way is a measurement approach wherein a set of received power measurements is used.
  • the whole set of measurements may be stored in order to keep a good knowledge of the statistical dependency between variables or the set is used to derive the mean and standard deviation of a Gaussian variable, i.e., the statistics of the measured variable is approximated by a Gaussian distribution.
  • the models depend on the definition of the zone Zone MT .
  • P G,HBS-MT HIRZi
  • HBSi G 0 HBSi + G pw HBSi + G ant , HBSi + G ant , MT - 10 ⁇ ⁇ HBSi - out log r DZ
  • HBSi x is the mean of x
  • G 0 HBSi is the reference path gain including antenna effects
  • G pw HBSi is the mean penetration gain in the buildings
  • G ant,HBSi and G ant,MT are respectively the home base station HBS and mobile terminal antenna gains
  • ⁇ HBS-out is the at
  • the model for P U,BS-MT and P I,BS-MT is a function that depends on the relative position of the mobile terminal MT with respect to the surrounding base stations not shown in Fig. 1 and the antenna diagram or on the distance between the base station BS and the mobile terminal MT and on the transmit power of the surrounding base stations.
  • variable component for P U,BS-MT and P I,BS-MT depends on Zone MT , in particular its size, on correlation properties and on standard deviation of shadowing.
  • the model for quantile evaluation may be based on different approaches.
  • the first approach is an empirical one.
  • Measurements of P U,BS-MT , P I,BS-MT and P G,HBS-MT may be processed in the first approach or samples of P U,BS-MT , P I,BS-MT and P G,HBS-MT may be generated by Monte-Carlo method based on a given model.
  • the second approach is a Gaussian-model based method.
  • the model for quantile evaluation is a Gaussian variable with a given mean and variance ⁇ 2 , computed from the estimate of mean of function f , the mean path-gain P G,F-MT ( Zone MT ) between the home base station HBS and the mobile terminals.
  • the parameters are obtained without simplification which will be disclosed hereinafter. That first variant is used on measurements of P U,BS-MT , P I,BS-MT and P G,HBS-MT or on samples of P U,BS-MT , P I,BS-MT and P G,HBS-MT generated by Monte-Carlo method based on a given model or on a model of P U,BS-MT , P I,BS-MT and P G,HBS-MT .
  • Y - P ⁇ ⁇ G , HBS - MT + f ⁇ ⁇
  • N Measures 1 N Measures f j or an analytic function of parameters like the mean and variance of P U,BS-MT and P I,BS-MT and where N Measures is the number of measures.
  • P t , HBS - P ⁇ ⁇ G , HBS - MT + f ⁇ ⁇ + ⁇ ⁇ Q N P out
  • the parameters are obtained with simplification using the mean and standard deviation of P U,BS-MT and P I,BS-MT .
  • the model for quantile evaluation is based on measurements of P U,BS-MT , P I,BS-MT and P G,HBS-MT or a model of P U,BS-MT , P I,BS-MT and P G,HBS-MT .
  • the third approach is a Gaussian-mixture-model based method.
  • the model for quantile evaluation is a mixture of Gaussian distributions, each Gaussian distribution having the same elementary standard deviation, using Monte-Carlo samples and a Gaussian model.
  • GMM Gaussian Mixture Model
  • the parameters are obtained without simplification which will be disclosed hereinafter.
  • the first variant of the third approach is used on measurements of P U,BS-MT and P I,BS-MT and a Gaussian model for P G,HBS-MT or on samples of P U,BS-MT and P I,BS-MT generated by a Monte-Carlo method based on a given model and a Gaussian model for P G,HBS-MT .
  • the parameters are obtained with simplification using the mean and standard deviation of P U,BS-MT and P I,BS-MT .
  • the second variant of the third approach is used on a model of P U,BS-MT and P I,BS-MT and measurements of P G,HBS-MT .
  • RT + Q GMM , ⁇ f , - P G , HBS - MT , j j 1 ⁇ N Measures P out
  • P t,HBS is such that: Pr ⁇ g ⁇ P U , BS - MT , P I , BS - MT , P t , HBS + P t , HBS - MT ⁇ RT
  • Zone MT P out .
  • g ( P U,BS-MT , P I,BS-MT , P t,HBS + P G,HBS-MT ) is a constant or increasing function of P U,BS-MT and P I,BS-MT and a decreasing function of
  • P I,HBS-MT P t,HBS + P G,HBS-MT .
  • g may be defined according to plural criteria.
  • the ratio defining g may be the ratio of SINRs or the ratio of Shannon capacities or the ratio of modelled spectral efficiency, or the ratio of empirical spectral efficiency.
  • SINR short-term evolution
  • SINR Max g ⁇ ( SINR Max ) where 1 X is the indicator function (equal to 1 for set X and 0 otherwise)
  • P I,BS-MT max ( P I,BS-MT , P U,BS-MT - 10 log ( SINR max )
  • Fig. 2 is a diagram representing the architecture of a base station in which the present invention is implemented.
  • the base station BS has, for example, an architecture based on components connected together by a bus 201 and a processor 200 controlled by the programs as disclosed in Figs. 4 and 5 .
  • the bus 201 links the processor 200 to a read only memory ROM 202, a random access memory RAM 203, a wireless interface 205 and a network interface 206.
  • the memory 203 contains registers intended to receive variables and the instructions of the programs related to the algorithms as disclosed in Figs. 4 and 5 .
  • the processor 200 controls the operation of the network interface 206 and of the wireless interface 205.
  • the read only memory 202 contains instructions of the programs related to the algorithms as disclosed in Figs. 4 and 5 , which are transferred, when the base station BS is powered on, to the random access memory 203.
  • the base station BS may be connected to a telecommunication network through the network interface 206.
  • the network interface 206 is a DSL (Digital Subscriber Line) modem, or an ISDN (Integrated Services Digital Network) interface, etc.
  • the base station BS may transfer messages to the core network of the wireless cellular telecommunication network.
  • the wireless interface 205 and the network interface 206 are the resources of the base station BS used by a mobile terminal in order to access to the wireless cellular telecommunication network when the mobile terminal establishes or receives a communication with a remote telecommunication device.
  • Fig. 3 is a diagram representing the architecture of a home base station in which the present invention is implemented.
  • the home base station HBS has, for example, an architecture based on components connected together by a bus 301 and a processor 300 controlled by the programs as disclosed in Figs. 4 or 5 or 6 or 7 or 8 or 9 .
  • the bus 301 links the processor 300 to a read only memory ROM 302, a random access memory RAM 303, a wireless interface 305 and a network interface 306.
  • the memory 303 contains registers intended to receive variables and the instructions of the programs related to the algorithms as disclosed in Figs. 4 or 5 or 6 or 7 or 8 or 9 .
  • the processor 300 controls the operation of the network interface 306 and of the wireless interface 305.
  • the read only memory 302 contains instructions of the program related to the algorithms as disclosed in Figs. 4 or 5 or 6 or 7 or 8 or 9 , which are transferred, when the home base station HBS is powered on, to the random access memory 303.
  • the home base station HBS may be connected to a telecommunication network through the network interface 306.
  • the network interface 306 is a DSL (Digital Subscriber Line) modem, or an ISDN (Integrated Services Digital Network) interface or a wireless link linking the home base station HBS to the base station BS, etc.
  • the home base station HBS may transfer messages to the core network of the wireless cellular telecommunication network.
  • the wireless interface 305 and the network interface 306 are the resources of the home base station HBS used by a mobile terminal in order to access to the wireless cellular telecommunication network when the mobile terminal establishes or receives a communication with a remote telecommunication device.
  • the wireless interface 305 may also comprise a positioning system like a Global Navigation Satellite System (GNSS) in order to obtain information representative of the location of the home base station HBS.
  • GNSS Global Navigation Satellite System
  • Fig. 4 discloses a general algorithm according to the present invention.
  • the present algorithm may be executed by the server Serv or by a base station BS or by at least one home base station.
  • step S400 a pre-computation is performed as it will be disclosed hereinafter in reference to Figs. 7 and 9
  • measurements are performed by at least one mobile terminal and/or at least one home base station HBS.
  • the measurements are gathered by the base station BS or at least one home base station HBS or by the server Serv.
  • the transmission power is computed for at least one home base station HBS by the base station BS or by the server Serv or by at least one home base station HBS.
  • Fig. 5 discloses a first example of inter cell interference coordination algorithm according to the present invention.
  • a global inter cell interference coordination is performed with control of base station BS degradation.
  • the same transmission power is used by each home base station HBS 1 to HBS4.
  • the control of base station degradation is more precisely the control of the degradation of signals radiated by the base station BS within the zone Zone MT which is equal to the union of HIRZ1 to HIRZ4.
  • Global inter cell interference coordination may be performed with both model-and measured data based values.
  • a Gaussian model is considered, measured data are used for evaluating the mean and variance of the Gaussian variable P I,BS-MT .
  • the base station BS interference received power P I,BS-MT on the zone HIRZi of the home base station HBSi for all the home base stations HBS1 to HBS4 is a Gaussian random value
  • the mean P ⁇ I,BS-MT and variance ⁇ P I , BS - MT 2 are estimated by the base station BS with collected interference measurements by different mobile terminals MT on signals transferred by the neighbouring base stations.
  • the radius r DZ , HBSi may correspond to half size of the building in which the home base station HBSi is located.
  • Data ⁇ ⁇ P I , BS - MT and P ⁇ ⁇ I , BS - MT may be empirical estimates of standard deviation and mean of P I,BS-MT on the whole cell CE of the base station BS.
  • This power value is sent or made available, for example via the server Serv or via the base station BS, to each home base station HBS1 to HBS4.
  • the mean path gain from the home base station HBSi to mobile terminals in zone HIRZi can also be estimated by home base station HBSi based on mobile terminals path gain measurements and not just from a propagation model.
  • the path gain measurements could be made by mobile terminals MT in HIRZi before handover from the base station BS to home base station HBSi and transmitted to home base station HBSi after handover has been completed.
  • the P G,HBS-MT subtraction is made by home base station HBSi and the base station BS only sends the mean level of interference on signals transferred by home base station HBSi to the mobile terminal ( ⁇ Q N ( P out ) + f ( P U,BS-MT , P I,BS-MT ; RT ).
  • the path gain from the home base station HBSi to mobile terminals in zone HIRZi can also be estimated by the base station BS based on mobile terminals path gain measurements and not just from a propagation model.
  • the P ⁇ G,HBS-MT subtraction is made by the base station BS.
  • the empirical interference level may be considered and not only mean and variance.
  • the third approach needs to be performed.
  • the mobile terminals MT located in the cell CE or, when their location is known, located in each zone HIRZ1 to HIRZ4 performs measurements of the power P I,BS-MT .
  • the measurements are accumulated, for example by the base station BS.
  • the power P t,HBS is computed based on models and/or measurements already disclosed. For example, the power is computed by the base station BS.
  • each home base station HBS is notified of the computed power P t,HBS from the base station BS or via the server Serv.
  • the power is corrected by each home base station HBS by subtracting to the power P t,HBS , the mean path gain P ⁇ G,HBS-MT between the base station HBSi and mobile terminal located in zone HIRZi.
  • step S504 is executed only in the first variant of the third approach, not in the second variant of the third approach.
  • the corrected power is applied by each home base station HBSi for transferring radio signals.
  • Fig. 6 discloses a second example of inter cell interference coordination algorithm according to the present invention.
  • a local inter cell interference coordination with equalisation is performed without control of base station BS degradation and without any information on the home base station HBSi to mobile terminal path gain model.
  • the power P U,BS-MT and P I,BS-MT are supposed to be constant over the zone Zone MT which is here equal to HIRZi and between two inter cell interference coordination updates. These two values are measured by the home base stations HBSi using a downlink receiver capability.
  • each home base station HBS performs measurements of the power P U,BS-MT and P I,BS-MT .
  • the power P t,HBS is computed based on the powers P U,BS-MT and P I,BS-MT .
  • the powers are computed by each home base station HBS.
  • Fig. 7 discloses a third example of inter cell interference coordination algorithm according to the present invention.
  • a local inter cell interference coordination is performed with control of base station BS degradation with both measurements and model based values.
  • g ⁇ P U , BS - MT , P I , BS - MT , P t , HBS + P G , HBS - MT log ⁇ 1 + 10 0.1 ⁇ P U , BS - MT 10 0.1 ⁇ P I , BS - MT + 10 0.1 ⁇ P t , HBS + P G , HBS - MT log ⁇ 1 + 10 0.1 ⁇ P U , BS - MT - P I , BS - MT
  • the received power of the signal transferred by the base station BS is considered to be constant in the zone HIRZi, i.e. the power values P U,BS-MT and P I,BS-MT are constant. These two values are measured by the home base station HBSi.
  • the receive powers of the neighbouring base station are variable and random inside the zone HIRZi.
  • ⁇ HBS,Sh is replaced by ⁇ HBS
  • Sh + ⁇ f and ⁇ f corresponds especially to standard deviation of base station interference power in the zone HIRZi.
  • the variables P U,BS-MT and P I,BS-MT are replaced by their average.
  • the home base stations HBS compute - P G,HBS-MT + ⁇ Q N ( P out ) .
  • the home base stations obtain data used for evaluating the mean and variance of the Gaussian variables P U,BS-MT and P I,BS-MT .
  • step S701 is executed only in the first variant of the third approach, not in the second variant of the third approach.
  • the power P t,HBS is computed based the power P U,BS-MT and P I,BS-MT .
  • the power is computed by each home base station HBS.
  • Fig. 8 discloses a fourth example of inter cell interference coordination algorithm according to the present invention.
  • a local inter cell interference coordination is performed with control of base station BS degradation. with only power data values for example based on measurements made by mobile terminals MT during handover between base station and home base station.
  • the mean path gain between home base station HBSi and mobile terminal in zone HIRZi is P ⁇ ⁇ G
  • HBS - MT 1 N Measures
  • ⁇ j 1 N Measures P G , HBS - MT , j .
  • Meas are supposed to be either measured by mobile terminals performing handover from base station BS to home base station HBS and transmitted after the handover has been completed or be measured by mobile terminals performing handover from home base station HBS to base station BS.
  • measurements are performed by mobile terminals, for example during handover between base station and home base station.
  • step S801 measurements are accumulated and centralised at home base stations.
  • each home base station HBSi evaluates the quantile on empirical data as already disclosed.
  • each home base station HBSi computes the power P t,HBS .
  • Fig. 9 discloses a fifth example of inter cell interference coordination algorithm according to the present invention.
  • a local inter cell interference coordination is performed with control of base station BS degradation, with position based measurement values and a propagation model.
  • the quantitative information of the path gain between the home base station HBSi and mobile terminal, the path gain between the base station BS and mobile terminal and the interference level in the zone of interest HIRZi need to be obtained.
  • a classic propagation model with shadowing and a circular zone HIRZi centered on the home base station HBSi of radius r DZ,HBSi are considered.
  • P t,BS,j is the transmit radio signal power of base station BSj and for interference power from neighbouring base stations BSj with j different from 0 plus Additive White Gaussian Noise:
  • P ⁇ I , BS - MT 10 log ⁇ 10 0.1 ⁇ G 0 , BS + G ant , MT + 10 log ⁇ ⁇ j / j ⁇ 0 10 0 ⁇ P t
  • the position of the mobile terminal MT with respect to each base station BS sector needs to be known in order to take into account the antenna selectivity. This can be made by reading on the core network the position of base station BS site, sector orientation and measuring the position of the home base station HBS in order to compute the distance and orientation relative to each base station. A simplification with an ideal rectangular angular antenna diagram of 120 ° width for tri-sector sites is possible.
  • the base station BS transmit power may also be obtained from the core-network or through the system information sent by the base station BS through the wireless channel.
  • each home base station HBS computes - P G,HBS-MT + ⁇ Q N ( P out ) .
  • the home base stations HBS obtain position based measurement values.
  • the home base stations compute the serving base station useful power and interference power from neighbouring base stations other than the serving base station BS.
  • each home base station HBSi computes the power P t,HBS .
  • distance instead of position may be used.
  • Gaussian interference model proposed in the core-network may also be directly exploited.
  • the base station BS model parameters can be estimated/refined by base station BS with the couple path gain - relative position measurements. These model parameters may be stored on the core-network and subsequently loaded by home base stations BS.
  • the present invention is applicable on all the frequency resources of the wireless telecommunication network or on at least part of the frequency resources of the wireless telecommunication network.
  • the present invention has also been disclosed in an example wherein the same threshold RT and outage probability P out are defined for all home base stations.
  • the present invention is also applicable when a threshold RT and outage probability P out are defined for each home base station (for example P out could be inversely proportional to the density of mobile terminals MT in the considered HIRZ).

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EP10191903A 2010-11-19 2010-11-19 Verfahren zur Anpassung der Übertragungsleistung der von mindestens einer Heimbasisstation übertragenen Signale Withdrawn EP2456267A1 (de)

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PCT/EP2011/068942 WO2012065827A1 (en) 2010-11-19 2011-10-28 Method for adjusting the transmission power of the signals transferred by at least one home base station
US13/824,659 US9167538B2 (en) 2010-11-19 2011-10-28 Method for adjusting the transmission power of the signals transferred by at least one home base station
CA2812654A CA2812654C (en) 2010-11-19 2011-10-28 Method for adjusting the transmission power of the signals transferred by at least one home base station
JP2013539187A JP5997172B2 (ja) 2010-11-19 2011-10-28 少なくとも１つのホーム基地局によって転送される信号の送信電力を調整する方法

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